Method for determining blank with different thicknesses for two-dimensional integrated loading and forming
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A billet and unequal technology, applied in the field of hot forging of difficult-to-deform alloys, can solve problems such as high cost, failure to consider local loading characteristics, and areas that cannot be filled
Inactive Publication Date: 2012-07-18
NORTHWESTERN POLYTECHNICAL UNIV
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[0013] In order to overcome the problems existing in the prior art that some areas cannot be filled, or the local loading characteristics in the overall forming are not considered, or the high cost is high, the present invention proposes a method for determining the unequal-thickness blanks for two-dimensional overall loading forming. method
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Embodiment 1
[0107] This embodiment is a method for determining the unequal-thickness blanks for integral loading and forming of rib-like members.
[0108] Such as Figure 4 As shown, the lower surface of the forming member in this embodiment has six ribs, and two of the ribs are located at both ends of the member. The widths of the ribs at the two ends of the component are different. Starting from one end of the rib with the wide end face, each rib is sequentially recorded as the first rib to the sixth rib. The material of the component is Ti-6Al-4V titanium alloy. The forming process in this embodiment shares one loading step.
[0109] In this embodiment, the integral loading forming of the rib-like member adopts an isothermal forming process, the forming temperature is 950°C, the upper die loading speed is 1 mm / s, and the friction factor m is taken as 0.3.
[0110] The specific process of determining the shape of unequal thickness blanks is as follows:
[0111] Step 1, simplify the cross-sec...
Embodiment 2
[0184] This embodiment is a method for determining the unequal-thickness blanks for integral loading and forming of rib-like components, such as Figure 8 As shown, the upper surface and the lower surface of the component of this embodiment each have 3 ribs; the ribs on the upper surface and the lower surface of the component are symmetrically distributed. And a pair of ribs are located at the ends of a pair of components. The material of the components is 7075 aluminum alloy. The forming process in this embodiment shares one loading step.
[0185] In this embodiment, the integral loading forming of the rib-like member adopts a hot die forging process, the blank temperature is 450°C, the mold temperature is 400°C, the upper mold loading speed is 10mm / s, and the friction factor m is 0.3.
[0186] The specific process of determining the shape of unequal thickness blanks is as follows:
[0187] Step 1, simplify the cross-sectional shape of the component;
[0188] The upper surface and ...
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Abstract
The invention discloses a method for determining a blank with different thicknesses for two-dimensional integrated loading and forming. The method comprises the following steps of: quickly forecasting material flowability and cavity filling of a multi-rib structural member during two-dimensional forming based on partial loading characteristics according to a resolving analysis calculation formula; quickly determining the shape of the blank with different thicknesses of a two-dimensional base body by quickly analyzing the material flowability and the cavity filling on a cross section; performing value simulation; modifying the shape of the blank with different thicknesses according to a value simulation result by considering the partial loading flow characteristics; and obtaining the final shape of the blank with different thicknesses by adjusting and modifying for zero or a plurality of times. According to the determined blank with different thicknesses, the problem that the cavity cannot be filled fully during forming can be solved completely, and the optimized design time is shortened. The determined of the blank with different thicknesses is distributed rationally; shortcomings that the cavity cannot be filled fully, the blank is folded and the like during forming are overcome; the machining allowance and the forming load are reduced; the shape of the blank is simple; and the blank is easy to make.
Description
Technical field [0001] The invention relates to the hot working forging of hard-to-deform alloys in the field of hot working, in particular to a method for determining blanks of unequal thickness for two-dimensional integral loading forming. technical background [0002] The use of high-performance lightweight alloy materials, such as aluminum alloys and titanium alloys, and the use of lightweight structures, such as thin-walled, integral, and ribbed structures, are effective technical ways to improve the performance and reliability of parts and components, and to achieve lightweight equipment . The rib-type integral member with high rib and thin web structure effectively improves the structural efficiency, reduces the weight of the equipment and has excellent service performance. It is an important lightweight bearing member in aerospace vehicles. [0003] Generally, in order to reduce useless material flow, the horizontal projection shape of the blank should be close to the forg...
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